# -*- coding: utf8 -*-

import sys
import six

CRC8_TABLE = [0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15,
              0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d,
              0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65,
              0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d,
              0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5,
              0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd,
              0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85,
              0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd,
              0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2,
              0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea,
              0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2,
              0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a,
              0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32,
              0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a,
              0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42,
              0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a,
              0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c,
              0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4,
              0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec,
              0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4,
              0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c,
              0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44,
              0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c,
              0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34,
              0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b,
              0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63,
              0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b,
              0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13,
              0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb,
              0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83,
              0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb,
              0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3]

class PlainBufferCrc8(object):
    @staticmethod
    def crc_string(crc, bytes_):
        if isinstance(bytes_, six.text_type):
            bytes_ = bytes_.encode('utf-8')
        elif not isinstance(bytes_, six.binary_type):
            raise TypeError("must be string, actual:" + str(type(bytes_)))

        if sys.version_info[0] == 2:
            for byte in bytes_:
                crc = CRC8_TABLE[((crc & 0xff) ^ ord(byte))]
        else:
            for byte in bytes_:
                crc = CRC8_TABLE[((crc & 0xff) ^ byte)]
        return crc

    @staticmethod
    def crc_bytes(crc, bytes_):
        for byte in bytes_:
            crc = CRC8_TABLE[((crc & 0xff) ^ byte)]
        return crc

    @staticmethod
    def crc_int8(crc, byte):
        return CRC8_TABLE[((crc & 0xff)^byte)]

    @staticmethod
    def crc_int32(crc, byte):
        for i in range(0, 4):
            crc = PlainBufferCrc8.crc_int8(crc, (byte>>(i*8)) & 0xff)
        return crc

    @staticmethod
    def crc_int64(crc, byte):
        for i in range(0, 8):
            crc = PlainBufferCrc8.crc_int8(crc, (byte>>(i*8)) & 0xff)
        return crc

__all__ = ['PlainBufferCrc8']
